GRP
The EDM700 has an RS232 port (output only I believe; this "market leading product" is a really crude piece of 1970s technology!) which the installer should bring out onto a jack socket, DB9 or whatever.
You then get their windoze software from their website, and use that to receive the data. The data is compressed binary of some sort and the prog has to decompress it, and it expands each flight into a .csv file, plus you get a .txt file listing all the flights. There is also a program (basically an Excel macro) which displays the temps in a nice graph (although you can do that in Excel as with any other data).
On the EDM you get the option to download all data or just 'new' data (i.e. since the last download). The logging rate is configurable but basically you get of the order of 10-50 hours' of recording.
The UK installed price bears no relation to the US list price. Avionics shops get a nice mark-up for supply and installation. I suppose on a Private CofA plane you could do the really time consuming work (routing the 12-14 thermocouple cables halfway around the world
) yourself.